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arXiv 0902.0537physics.plasm-ph
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非平衡相对论等离子体辐射的动力学理论

Kinetic Theory of Radiation in Nonequilibrium Relativistic Plasmas

V. G. Morozov, G. Roepke

摘要:

多粒子QED被应用于含有相对论电子和非相对论重粒子的多组分等离子体中辐射过程的动力学理论。在非平衡格林函数技术的框架内,得到了电磁场涨落的输运方程和质量壳方程。我们表明,横向场的关联函数可以分解成尖锐的峰值(非洛伦兹)部分,描述共振(传播)光子和离壳部分对应的虚光子等离子体。纵向场关联函数和相对论电子的关联函数也有类似的分解。作为一个新的结果,导出了有限谱宽共振光子的动力学方程。粒子和场关联函数的离壳部分对于计算相对论等离子体中的局域辐射功率和恢复真空QED的结果是必不可少的。讨论了等离子体效应和相对论准粒子谱函数的碰撞加宽对辐射过程的影响。

英文摘要:

Many-particle QED is applied to kinetic theory of radiative processes in many- component plasmas with relativistic electrons and nonrelativistic heavy particles. Within the framework of nonequilibrium Green's function technique, transport and mass-shell equations for fluctuations of the electromagnetic field are obtained. We show that the transverse field correlation functions can be decomposed into sharply peaked (non-Lorentzian) parts that describe resonant (propagating) photons and off-shell parts corresponding to virtual photons in plasmas. Analogous decomposi- tions are found for the longitudinal field correlation functions and the correlation functions of relativistic electrons. As a novel result a kinetic equation for the reso- nant photons with a finite spectral width is derived. The off-shell parts of the particle and field correlation functions are shown to be essential to calculate the local ra- diating power in relativistic plasmas and recover the results of vacuum QED. The influence of plasma effects and collisional broadening of the relativistic quasiparticle spectral function on radiative processes is discussed.

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